Particle-containing polyether alcohols

The present invention is a particle-containing polyether alcohols can be prepared by in situ polymerization of olefinically unsaturated monomers in polyether alcohol, wherein the polymerization is at least one polyether chain containing at least one reactive hydrogen atom and at least one polyether chain containing polysiloxane chain attached, particle-containing polyethers which comprises carrying out in the presence of at least one compound (a) containing at least one olefinic double bond It related to alcohol.